After finally seeing what Dead Space 3 is about, I have to admit that it is not the worst bad sequel I have ever seen and it actually had a great start storywise. It's the big reveal that was a huge letdown over where the markers truly come from.
That and the brethren moons concept is more silly than scary to me. Sometimes, the simple idea is the best one which would have been to either say it was an experiment gone wrong or leave the mystery unsolved which would have truly been original.
I get the Lovecraftian space horror themes and everything leading up to it was great, but the big reveal was disappointing for me. I think the brethren moons best serve as a lesson that bigger is not always better.
Sometimes, the mystery is best left unsolved especially in horror and just keep it simple. It’s like a joke. When you explain, it stops being funny. When you explain horror, it stops being scary.